Kim Petras is a 16-year-old aspiring pop star from Cologne, Germany. She is also the youngest known sex change patient in the world.

Kim Petras, who used to be Tim Petras, has blonde hair and likes pop music stars like Beyonce and Gwen Stefani. She wants to be a superstar - and her story is an intriguing one.

Kim decided to make a life-changing decision at a very young age - last October, when she turned 16, she had a sex change operation to become a female.

Kim explains to The Sun: "There never was a defining moment when I thought, 'I'm not meant to be a boy.'"

"I've lived my entire life as a girl."

The legal age for a sex change operation in Germany was 18 before Kim campaigned and changed the law - and in turn becoming the youngest-known patient to undergo a sex change operation.

Hormone specialist Dr. Achim Wuesthof says of Kim Petras: "To the best of my knowledge, Kim is the youngest sex change patient in the world."

"According to German law, two independent psychiatrists must confirm that the child is indeed transsexual and approve the sex change. Once that has been done, it is best to start as early as possible."

Visit The Sun here for before and after photos and more on Kim's story.